She graduated from Scranton Preparatory School in 1990 and received a Bachelor of Science in nursing from Villanova University in 1994.

Prior to elected office, Bridget Malloy Kosierowski worked as a Registered Nurse for 25 years.

Kosierowski was named "2021 Legislator of the Year" by The Pennsylvania Society of Oncology and Hematology for her strong advocacy for pediatric cancer research and her work to bring forward a bipartisan bill supporting the largest effort to fund pediatric cancer research in the Commonwealth of Pennsylvania.

Kosierowski was honored as ‘State Official of the Year’ by Life Sciences Pennsylvania for her work as COVID-19 Vaccine Task Force member.

Appointed by Pennsylvania Governor Tom Wolf to serve on his administration's COVID-19 Vaccine Joint Task force in February 2021.